Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Summary of Significant Accounting Policies [Line Items]
Financing Receivable, Significant Sales	$ 31,800	$ 0	$ 50,600	$ 0
Financing Receivable, Significant Sales, Transaction Fees	$ 100		200
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			$ (60,000)	$ 67,700
Minimum fiscal year period in days			364 days
Maximum fiscal year period in days			371 days
Fiscal quarter period in days	91 days	91 days
Fiscal Year to Date in Days			182 days	182 days
Basic:
Net income	$ (30,420)	$ 9,149	$ 66,885	$ 14,978
Shares (in shares)	164,651,000	164,718,000	164,774,000	164,728,000
Per Share (in usd per share)	$ (0.18)	$ 0.06	$ 0.41	$ 0.09
Effect of dilutive securities: [Abstract]
Add: Option shares in the money and dilutive effect of non-vested stock (in shares)	0	4,166,000	2,536,000	3,089,000
Less: Pro forma treasury shares (in shares)	0	(2,053,000)	(1,051,000)	(1,469,000)
Diluted:
Net Income	$ (30,420)	$ 9,149	$ 66,885	$ 14,978
Shares (in shares)	164,651,000	166,831,000	166,259,000	166,348,000
Per Share (in usd per share)	$ (0.18)	$ 0.05	$ 0.40	$ 0.09
Stock Options [Member]
Antidilutive Securities [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	3,801,665	772,402	2,275,607	791,116
Non Vested Stock [Member]
Antidilutive Securities [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,634,828	680,100	1,475,394	853,313